Segment information - Reported Revenue and Profit Before Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Revenue
Total revenue	$ 266,028	$ 373,282
Income (loss) before income taxes
Pre-Tax Income (Loss)	14,213	52,127
Private Client Division
Revenue
Total revenue	150,847	164,023
Income (loss) before income taxes
Pre-Tax Income (Loss)	$ 24,146	24,263
Asset management fees (as a percent)	90.00%
Asset Management
Revenue
Total revenue	$ 27,117	24,230
Income (loss) before income taxes
Pre-Tax Income (Loss)	$ 9,474	7,553
Asset management fees (as a percent)	10.00%
Capital markets
Revenue
Total revenue	$ 85,051	183,599
Income (loss) before income taxes
Pre-Tax Income (Loss)	1,166	49,991
Corporate/Other
Revenue
Total revenue	3,013	1,430
Income (loss) before income taxes
Pre-Tax Income (Loss)	$ (20,573)	$ (29,680)